Artifacts of Power is now available on Steam, offering the promised first DLC for Orcs Must Die!, Robot Entertainment's action/strategy game. Here's word on the pack, which is on sale for 20% off over the next week:

Expand your Orcs Must Die! arsenal with two new weapons and two new traps. With the Artifacts of Power in your spellbook, you’ll be demolishing levels, beating your friends on the leaderboards, and most importantly, killing a bunch of orcs deader than dead. Only the best tools for the last surviving War Mage!